Protecting device for spring-pressed valves.



Wammes.

Patented Feb. l2, I9DI. H. STEIN. v PRoTEcTmG nEvlcE Fon sPmnaPnEssEnVALVES.

(Application led Oct. 5, 1900.)

(No Windel.)

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llrvitnn rains lllllCE HERMANN STEIN, OF HAMBURG, GERMANY.

SECIFICATION formingpart of Letters Patent No. 668,065, dated February12, 1901. Application filed October 5, 1900. Serial No. 321166. (Nomodel.)

To @ZZ when?, t may concern:

Be it known that l, HERMANN STEIN, a citizen of the free city ofHamburg, residing at Hamburg, in the German Empire, have inventedcertain new and useful Improvements in Protecting Devices for AdjustableSpring- Pressed Valves, (tor which I have applied for patents inEngland, No. 14,421, dated August ll, 1900; in Germany, St. 5,946V/ 13,dated April 24, 1899, and in France, No. 291,346, dated August I7,1900,) of which the following is a specification.

This invention relates to a protecting device for adjustablespring-pressed valves, and has for its object the prevention of anyunauthorized interference with the apparatus, particularly as regardsalteration of the weighting 'of the valve.

This invention has the advantages over known devices designed for thesame purpose that it is more simple and that it fulfils its purpose withgreater certainty.

The characteristic feature of the invention is a detachable hood orcover provided over the valve-stem for the guidance of the latter andwhich carries the screw for adjusting the springs. A steam-channelpasses from the interior of the boiler to below the flange of the hoodor cover, such flange making a good joint to cut ott communicationbetween the steam and the atmosphere. Should any attempt be made toremove the hood for the unauthorized alteration of the Weighting ot' thevalve, steam escapes from the channel into the atmosphere by reason ofthe channel being opened through the loosening of the hood and preventsthe valve being further interfered with as long as the boiler is understeam-pressure.

In the accompanying drawings I illustrate, as an example, how theinvention may be carried into eitect.

Figure I is an elevation. Fig. 2 shows a transverse section, and Fig. 3is a plan.

A valve-casing a has an upward cylindrical continuation b, which formsthe casing for a spiral spring c, acting on the valve by bearing againstand pressing on a collar d of the valvestem e. This pressure of thespring is regulated by a screwf, screwed into the neck 5o of the casingb. The valve-rod extends upward through this screw.

The casing h has cast with it at the rear a steam-chan nel g, extendingfrom the valvebox to the top of the spring-casing h, which 55 guides thevalve-rod e and incloses the adjusting-screw j, so that the latter canonly be actuated after removal of the hood.

Should any attempt be made to remove the hood while the boiler is underpressure, then, 6o as before mentioned, steam escapes from thesteam-channel 'q on the loosening of the hood and prevents furtherinterference.

A testing or trial tap may be provided at the upper end of the channelg. 65

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

l. The combination of a valve adapted to be unseated by predeterminedpressure, a valve-casing, a passage in the Wall of said 7o casing, and aremovable cover for said casing adapted to prevent tampering with thevalve and to close said passage when in proper position, for the purposeand substantially as described.

2. The combination with a valve, its casing, a steam-passage leadingthrough the casing exterior to the valve, means for adjusting thepressure on the valve, and a hood or cover adapted to protect saidadjusting 8o mechanism and to close said steam-passage when in position,for the purpose and sub stantially as described.

3. The combination of a safety-valve, its stem, the casing surroundingthe stem, the S5 spring for seating the valve, and the springadjustingdevice; with a steam-outlet passage in the walls of the valve chamberand casing, and a cover adapted to be secured to said casing to protectthe adjusting mechan- 9o ism and close said steam-passage, for thepurpose and substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twoWitnesses.

HERMANN STEIN.

Witnesses:

Lno TOLLES, IDA HAFERMANN,

